feat: preserve body history and placed modelling workflows

Record ownership transfers in the timeline so earlier Join/Cut membership,
world placement, machining data and styles survive component moves, edits,
independent copying, undo and reopening. Preserve pending positions in history
snapshots and keep constructor transfers ordered during feature redefinition.

Retain shallow sheet pockets and exact planar intersection islands through
unfold/refold, with depth-aware flat previews and DXF export. Store explicit
3D wire coordinate spaces and migrate known legacy provenance without moving
saved points or analytic fits.

Infer unique eligible cylindrical Emboss targets, align Revolve manipulators
with actual extent geometry, and discard obsolete preview errors after input
correction. Certify constructed and immutable imported face styles using exact
source metadata while preserving legacy face names. Upgrade designs to format10
with bounded validation and geometry-preserving legacy migration.

docs/occurrence-workflows.md

@@ -24,7 +24,7 @@ Activate a placement to author shared geometry through its frame:
 {"component":3,"occurrence":4,"path":[2,4]}
 ```
 
-New geometry belongs to the component and appears in every instance. The selected frame determines how world inputs become local component geometry. Planar sketches display at the active placement during authoring. Component-only activation keeps the first-placement behavior. Existing 3D wires retain their prior coordinate behavior; their mixed legacy coordinate storage needs a separate migration before occurrence authoring can apply consistently.
+New geometry belongs to the component and appears in every instance. The selected frame determines how world inputs become local component geometry. Planar sketches and new 3D wires display at the active placement during authoring. Component-only activation keeps the first-placement behavior. Format 10 stores an explicit World or Component coordinate marker for 3D wire samples and fit points. Older drawn and detached wires retain their world positions; retained Include and surface producer links keep their component meaning, including lost references. Breaking a link preserves its explicit marker. Activate the desired occurrence before supplying world inputs to an explicit sketch owned by a repeated, nonactive component.
 
 Visibility is an independent view setting for exact placements. Hide a path and all descendants with `browser.visibility`:
 
@@ -44,4 +44,10 @@ Configuration columns, row values and internal rules are duplicated for copied t
 
 A body reassigned from an external component receives an independent BaseFeature before the first copied feature that modifies it. Copied modifiers then replay once. The command reports these frozen bodies. Public user parameters remain design-wide; retained external sketch, project and feature links are reported. Joints and motion records wholly inside the copied occurrence graph receive new references. Records crossing its boundary are omitted with notices.
 
-Copy evaluates on a scratch document, checks that original bodies remain unchanged, and verifies copied body measurements and sampled material occupancy before adopting it. Unsupported cross-boundary destructive operations, configured foreign faces without certified semantic lineage, reassigned mesh bodies, rolled-back timelines and exceeded work limits return errors without a partial copy. A successful copy selects the new occurrence, preserves your active component and unrelated pending positions, and places the copy under the chosen parent occurrence path. Activate the new occurrence to author features in it. Existing 3D sketch wire coordinate behavior is copied unchanged.
+Copy evaluates on a scratch document, checks that original bodies remain unchanged, and verifies copied body measurements and sampled material occupancy before adopting it. Unsupported cross-boundary destructive operations, configured foreign faces without certified semantic lineage, reassigned mesh bodies, rolled-back timelines and exceeded work limits return errors without a partial copy. A successful copy selects the new occurrence, preserves your active component and unrelated pending positions, and places the copy under the chosen parent occurrence path. Activate the new occurrence to author features in it. Paste New preserves each 3D wire's World or Component marker and stored coordinates: Component wires follow the copied placement, while World wires retain their physical world positions.
+
+Create Components from Bodies and Move Bodies to Component now add ownership-transfer features at the current timeline position. Earlier joins, cuts and face selections keep their original component frames. At the transfer, geometry converts once into the destination frame; later features authored there operate on the transferred body. Rolling the timeline back before the transfer displays the original owner. Body materials and face identity survive the transfer, and an inherited source-component appearance becomes a body override to preserve its visible look.
+
+Transfers preserve the body's world pose through rotated or translated parents. Pending positions on the involved source and destination paths are captured atomically with the transfer so save/reopen retains that pose; unrelated pending positions remain pending. Undo and checkpoint restoration recover the original pending positions as well as the feature history; redo restores the captured transfer. The operation requires one source and one destination placement. Shared instance definitions with several placements are rejected because a single ownership change cannot preserve several different world poses. A component that supplies transfer history outside its subtree cannot be deleted until that dependent history is removed.
+
+Older files without transfer features keep their saved assignment and offset behavior. No transfer timestamp is inferred from their final ownership map. Paste New freezes externally authored geometry after its successful entry transfer and remaps internal transfers, then replays later modifiers once. All transfer commands validate and evaluate on a scratch document before adoption.